The Study On The Green Biomass Of Eight Kinds Of Evergreen Coniferous Tree Species In Hohhot City

Through the study of the green amount of eight evergreen tree species in Hohhot,the paper lays the foundation for the ecological benefit and function of the city,the use of trees and the green quantity of the city,and provides effective data for the construction of the urban green space in the future.The green amount in urban green space depends on the area of green space,the green coverage rate,the hierarchical structure of plant configuration,the technical nature of plant species and so on.The green coverage rate is large and the plant configuration adopts the compound layer structure model of the grass and grass,which can improve the green value of the green space.At the same time,the plant is full of trees,large volume and fast growing trees,and it can also rapidly improve the green value of green space.It is necessary to expand the area of green space as far as possible to ensure plant diversity and the plant configuration pattern of the compound structure of grass and grass.In this paper,8 representative species of evergreen coniferous trees common in Hohhot were selected:Pinus tabuliformis Carrière,Pinus sylvestris var.mongolica Litv.,Juniperus rigida S.et Z.,Pinus bungeana Zucc.,Pinus armandii Franch.,Picea wilsonii Mast.,PLatycladus orientalis(L.)Franco and Sabina chinensis(L.)Ant..The leaf area index(LAI)and green amount of 8 evergreen coniferous trees were used by CI-202 handheld laser leaf area meter and altimeter.The research and analysis are carried out.The urban area of Hohhot is the main research site.The geographical location of the research site is accurate and the terrain is gentle.The conditions of climate temperature,hydrology,soil type and vegetation type are relatively stable,and there is no great change.In this paper,the method of field investigation was used to establish multiple samples,and the growth indexes of hundreds of plants were recorded:tree height,crown,breast diameter,thickness of leaf curtain,and higher branches.The CI-202 hand-held laser leaf area meter measured the perimeter,area,length and width of the single leaf of 8 plants,and finally collated,analyzed and studied the data.(1)to measure the height and DBH growth index of green quantity equation parameters,the urban area of Hohhot City,Pinus tabuliformis Carrière,Pinus sylvestris var.mongolica Litv.,Juniperus rigida S.et Z.,Pinus bungeana Zucc.,Pinus armandii Franch.,Picea wilsonii Mast.,PLatycladus orientalis(L.)Franco and Sabina chinensis(L.)Ant..8 species of evergreen coniferous tree is established.(2)8 species of evergreen coniferous tree in a certain range of the average amount of green crown order:Juniperus rigida S.et Z.(87.19 m~3)>Sabina chinensis(L.)Ant.(53.86 m~3)>Pinus tabuliformis Carrière(51.72 m~3)>PLatycladus orientalis(L.)Franco(50.11 m~3)>Picea wilsonii Mast.(25.46 m~3)>Pinus bungeana Zucc.(24.30m~3)>Pinus armandii Franch.(17.98 m~3)>Pinus sylvestris var.mongolica Litv.(11.10 m~3).The average leaf area index of 8 evergreen coniferous tree species of the order is:Sabina chinensis(L.)Ant.(187.2)>Juniperus rigida S.et Z.(126.1)>PLatycladus orientalis(L.)Franco(108.9)>Picea wilsonii Mast.(33.6)>Pinus bungeana Zucc.(21.2)>Pinus armandii Franch.(20.8)>Pinus sylvestris var.mongolica Litv.(16.6).From the data obtained,we can see that although the plant environment is the same,the number of leaves and the thickness of the leaf screen are obviously different,which indirectly reflects the growth of plants in the urban area of Hohhot.(3)According to the research method of this paper,the correlation analysis of morphological index and green amount of 8 evergreen coniferous tree species is carried out.The regression equation of green quantity of other species in urban green space application can be established,which provides more choice for the choice of evergreen coniferous tree species in the construction of Hohhot City green space in the future.The theoretical basis.(4)The quantitative statistics of evergreen coniferous tree species in Hohhot city are carried out.The ecological indexes and the three dimensional Green amount of different trees are analyzed,and the main types of the main urban green coniferous tree species are summed up,and the objectivity and rationality of the selection of local tree species is measured objectively.